High tension condenser



g- 1 w. REGERBIS ET AL 1,370,141

HIGH TENSION CONDENSER Filed Aug. 3, 1929 8 Sheets-Sheet 1 al H9 7 F/g.U

Aug. 2, 1932.

w. REGERBIS ET AL HIGH TENSION CONDENSER Filed Aug. 5. 1929 8Sheats-Shaet 2 g- 2, 1932- w. REGERBIS ET AL 1,370,141

HIGH TENSION CONDENSER Filed Aug. I5. 1929 8 Sheetas t 3 Aug. 2, 1932.w. REGERBIS ET AL HIGH TENSION CONDENSER Filed Aug. 3, 1929 8sheets-Sheet 4 I'llll 2, 1932- w. REGERBIS ET AL HIGH TENSION CONDENSERa sneetyshee-t' '5 Filed Aug. 3. 1929 Aug. 2, 1932. w. REGERBIS ET ALHIGH TENSION CONDENSER Filed Aug. 3, 1929 v 8 Sheets-Sheet 6 Aug. 2,1932.

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HIGH TENSION CONDENSER Filed Aug. 3, 1929 8'Sheets-Sheet 8 Fig. 15

Jnvenfars:

Patented Aug. 2, 1932 UNITED STATES PATENT. OFFlCE WILHELM. REGERBIS, OFHERMSDORF, AND MARTIN HANDTRAG, OF IBERLIR- FRIEDENA'U, GERMANY,ASSIGNORS T HERMSDORF-SGHOMBURG ISOLATOREN,

HIGH TENSION CONDENSER Application filed August 3, 1929, Serial No.388,245, and in Germany August 3, 1928.

Our invention concerns improvements in electrical high-tensioncondensers, more particularly in such as are used in so-called wiredwire-less systems in which high frequency currents are to be transmittedto high-voltage lines for signalling or communicating pur poses.

( Condensers of this kind are subject to various extreme requirementswhich, prior to our invention, could not satisfactorily be compliedwith. The failures experienced in the past were caused by selection ofunsuitable materials for the dielectric parts and by unsuitabledimensions and shapes thereof.

The condensers which have most extensively been used in practice consistof an impregnated paper-tube provided with internal and external metallinings. This dielectric must be protected from atmospheric in sofluences, particularly from moisture and, for this purpose, the papercondenser was enclosed in a porcelain casing. Such a porcelain casing,however, is objectionable in that it re quires the use of fillingmaterials between its walls and the condenser proper which fillingmaterials give rise to troubles. Moreover, the dielectric materialemployed in paper condensers causes considerable dielectric losses.

In order to avoid these disadvantages the use of porcelain or glass as adielectric for high-tension condensers has been suggested prior to ourinvention. The constructions developed along these lines, however, could5 not successfullysatisfy the extreme requirements'which must be metwith in practical operation.

A condenser of the typev to which the present invention relatescomprises a condenser 40 portion proper provided with internal andexternal conductive linings or coatings and a lead-through portionserving to' insulate the conductor extending from the inner lining ofthe condenser part 'to the outer terminal which is subjected to the fullforce of the high voltage. It will be observed that, in such acondenser, unintended marginal discharges between the outer terminal andthe outer lining of the condenser portion must be avoided. One of theobjects of our invention the lower terminal as is necessary for theoperation with high voltages.

These and other o'b'ects of our invention which will appear from thedescription following hereinafter are attained by a condenser in whichthe condenser portion proper is formed by a thin-walled substantiallycylindrical hollow body of a silicic material, such as porcelain orglass, which is sealed at one end by a suitable end-wall and provided,with an inner and an outer conductive coating. This condenser portion isattached to, preferably integral with a leadthrough portion likewiseconstituted by a thin-walled hollow body of porcelain or glass providedwith ribs or pettlcoats to counteract discharge thereover. The shape ofthe lead-through portion may be cylindrical or conical or'barrel-like.

When referring in the claims to silicic material we mean to definethereby glass or porcelain or ceramic materials similar to porcelainsuch as earthen-ware or the like.

Our novel condenser may be manufactured in various ways. While weprefer, as a rule, to make both portions integral in one piece, it issometimes advantageous to produce both portions in different pieces asthis affords a possibility of using different materials for both ofthem, each portion being made from a composition which is particularlyadapted to meet the special requirements. The dielectric. of thecondenser portion, for instance, must have an extreme dielectricresistibility against puncture and a very high dielectric coeflicient,while the lead-through portion needs a very high mechanical and thermicresistibility. In case of the condenser being formed of two non-integralportions, the condenser portion may be more or less telescoped into thelead-through portion whereby the entire height of the structure may bekept low and the condenserportion may be arranged in a protectedposition.

. In the latter case we sometimes prefer to enclose the condenser partin a metal housing attached to the lead-through part. If thisarrangement is chosen the condenser part may be relieved from mechanicalstrains in favour of a greater reliability in operation. Thisarrangement provides, moreover, for a possibility of forming thecondenser part from a ceramic material which need not have anyappreciable mechanic resistibility but may be elected to solely complywith the requirements of suitable dielectric properties.

A feature of particular importance is the connection between theconductor and the conductive condenser coatings. We form this connectioneither by soldering, or by contact springs suitably pressed against thecoating.

To adapt the structure to extremely high voltages we connect a pluralityof individual condensers in series to form a chain comparable with thewell-known insulator-chains. For this purpose, both ends of theindividual condensers are provided with suitable fittings similar tothose of chain-insulators.

Another feature of our invention resides in a specific shape of theinner surface of the condenser portion which will favorably influencethe electric field distribution, as will be explained in the descriptionfollowing hereinafter.

In the accompanying drawings a number of embodiments of our inventionare. illustrated.

Fig. 1 is an elevational view, partly in section, of an embodiment inwhich condenser port-ion and lead-through portion are integral with eachother;

Fig. 2 is a similar view of another embodiment;

Figs. 3, 4, 5, 11 and 11a represent various embodiments some of whichhave integral condensers and lead-through portions while in otherembodiments these portions are formed by separate parts suitablyconnected to each other;

Fig. 6 illustrates an alternative form of the portion shown in the lowerpart of Fig. 5;

Figs. 7. 8 and 9 represent various alternative cons ructions of a detailshown in Fig. 5;

Fig. 10 shows an element which may be substituted for the annular coil23 in Fig. 5;

Fig. 12 is similar in certain respects to Fig. 5;

Fig. 13 shows an alternative form of the lower portion of the condenserrepresented in Fig. 12;

Figs. 1 to 17 show different constructions in which the leatl throughpart is arranged below the condenser part;

Figs. 14 and 16 represent the arrangement of a plurality of condensersin a chain. Fig.

18 depicts a structure incorporating most of the novel features of ourinvention.

In the construction illustrated in Fig. 1, a comparatively thin-walledbody of suitable silicic material such as porcelain comprises an upperpart Z) similar to a lead-through insulator and a lower part (Lconstituting the condenser proper. The condenser portion is providedwith an internal conductive sheath 2 while an external sheath 1 isarranged on the exterior surface commencing approximately in the middleportion of the body and extending to the lower end thereof. The partcovered by this exterior sheath 8 constitutes the condenser portion aproper.

The upper and the. lower end of the body are provided-with covers 4 bothhaving littings 6, such as are customary in chain-insulators, permittingof arranging a number of such condensers in series. The exterior sheath1 of the condenser portion is electrically connected to the lower cap 4while the interior sheath 2 is connected to the cap 5 by a conductor 7which at its upper part is insulated by a paper sleeve 13 or otherwise.The lead-through portion 6 functions to insulate this conductor 7, thepetticoats 3 preventing surface discharge between the margin of thesheath 1 and the cap 5. The inner sheath 2 may be limited to the portiona of the condenser, if desired. The exterior sheath 1 terminates withina turned-down petticoat 8.

The condenser need not be arranged in vertical position but may bemounted to have an inclined or horizontal position. It could also beturned upside down with reference to Fig. 1. In this case the petticoatswould have to be slightly changed.

In such a condenser, surface discharges may occur between the two lowestsheds adjacent the rim of the exterior coating unless specialprecautions be taken to avoid excessive field intensities in theneighborhood of that rim.

With a View to this object we provide the inner wall of the condenser ata point between the two sheds nearest the outer "coating preferably at apoint approximately opposite the gutter in which the outer coating onthe condenser terminates, with an annular rib projecting obliquelyupwards, an oil or other filling being with advantage also provided atthis point by shaping said rib. to create a container therefor.

In the embodiment shown in Fig. 1 an an- I nular rib 9 is providedprojectingobliquely and upwardly from the inner wall of the ceramic bodyat that point of the wall which lies between the two external sheds 3which are nearest to the support, the inner surface of said rib beingprovided with a conductive. sheath extending to or almost to the edge 10in such a manner that this conducting sheath in the form of a concaveconstitutes an unbroken extension of the inner sheath 2 of thecondenser. Alternatively, however, a funnellike wall ll may be provided,as illustrated in Fig. 2, which forms a chamber 12 which can be filledwith oil or other filling material. The concentrated electric field nearthe margin of the sheath will thus be situated within a dielectric otherthan air.

The occurrence of the above-mentioned surface discharge is prevented byeither of these precautions.

In Fig. 3 the ceramic condenser consists of a condenser portion a and alead-through portion b which are prepared out of one piece. As in Figs.1 and 2 it is provided with sheds 3 on the upper surface and has,beneath the lowest shed, a hollow channel or concave 8. Approximately atthe position of the lowest shed, the inner surface is provided with anannular rib 11, which is extended so far upwardly that it surrounds thelead-in electrode 7 for a certain distance. filling 12 extends accordingto requirements, for example, up to the point 14, where appreciablestresses due to the electric field no longer occur in the hollow spaceof the upper portion which resembles a lead-through bushmg. I

At the position where the hollow channel or concave 8 is provided, thebody of the condenser is suitably constricted and this, in conjunctionwith the above-mentioned characteristics has the effect that theelectric field is almost entirely restricted to the insulating material,and consequently glow and surface spark discharge at the edges of thecoating cannot occur. In this manner the requisite very high degree ofsafety is obtained for high tension condensers of the kind mentioned,which, for example, are used as coupling condensers for high frequencytelephony.

The inner coating 2 as well as the outer covering 1, which in generalareprepared by spraying metal or by electro-chemical precipitation, arepreferably reinforced by a second covering 16, which is electrolyticallyprepared. The connection of the inner sheath with the lead-in electrode7 can be effected by aconnecting member 17, which is pressed firmlyagainst the inner coating bymeans of a spring 18 inserted between a disc19 which carries an extension rod of the member 17, and the upper cap 5.Alternatively, the intermediate member 17 may be fastened to thereinforcing covering 16 by soldering. In Fig. 3-the inner coating-2,,together with the second covering 16, is extended over the innersurface of the annular rib 11 up to approximately its upper end, andterminates here in a concave 15.

The manufacture of such ceramic bodies in which the dielectric of thecondenser portion and the lead-through portion consists of a singlepiece at porcelain, or other material,

The oil or paste or glass, is very expensive. Generally a wastage ofmore than 50% must be expected on account of the peculiar form of thecondenser portion with its upwardly projecting annular rib alone,whereas the lead-through portion taken alone can be made-withcomparatively small losses. This disadvantage can be overcome if, asshown in Fig. 4, the ceramic body is constructed in two portions, andthe two portions are subsequently fixed together. Thus itv is notnecessary to throw away the complete body when the lower part, which ismore diflicult to manufacture, is faulty.

As shown in Fig. 4, the condenser portion a is secured to thelead-through portion 12 by means of a metal fastening 20, in which thetwo portions are cemented. In all other respects, the condenser iselectrotechnically identical with the embodiment of Fig.3.

The question of protection of the condenser portion against damage mustbe specially taken into account'in connection with the embodimentspreviously described and also similar embodiments, in which thecondenser portion is not insertedwithin the covering 12, but is exposedbeneath this latter. In such embodiments it appears advisable to providethe condenser portion with special protection against mechanical damage,as is shown in Fig. 5. Here the condenser portion,which, as in Fig. 4,is secured to the protective cover by means of a flanged ring member 20,is surrounded by a sheath 21 of sheet metal or other suitable material,which is secured to or integral with the flange 20. The condenserportion is completely protected within this sheet metal covering in thesimilar manner to a thermos fiaskwithin its housing.

It is also very advantageous to relieve the condenser portion a of allmechanical stresses, which may occur in the above-described embodimentswhen a further high tension condenser of a series is attached to thecondenser portion. This is effected, as shown in Fig. 6, by securing tothe lower part of the protective sheath 21, a base 22 which is providedwith a fork-shaped extension 6,

to make possible the attachment of a further condenser. The flange 20,sheath 21 and base 22 can be. made in a single piece, so that the bodyformed thereby is in the shape of a j ar.

Attention must also be'given to the connection of the conductivecoatings with the terminals of the condenser, as excessive heating ofthe dielectric and in consequence breakdown and injury to the metalsheath would be caused by bad contact. very suitable method and mannerof conductively connecting the inner coating with the armature is bymeans of resilient contact members such as member 17 shown in Figs. 3and 4. In similar manner the conductive connection with the outercoating of the condenser p'or- Figs. 12 and tion a can be effected bythe insertion of a spring between the outer condenser coating and thesheet metal protective sleeve 21 which constitutes one of both terminalsof the condenser. I

Various forms of inserted leaf springs 28, 29, 3.0, 31 are shown inFigs. 5 to 9, and require no further description. In Figs. 7 and 9 s'-ch springs are secured to the sheet metal sleeve 21, and contact withthe coated outer surt'ace of the. condenser part a. In Fig. 8 theopposite arrangement is used; the springs are secured to the coatedinsulator wall 2 by means of a strip 32, and are in resilient contactwith the sheet metal sleeve.

The conductive connection between the bolt- 7 and the inner coating 2may be effected by means of an annular wire coil 23 carried by a screwor nut 24. In Fig. a resilient interrupted ring 25 is shown which may besubstituted for the coil 23 to be pressed outwardly against the innercoating by means of radial springs 26 This ring is in good conductiveconnection with the cap 5 by means of a wire 27.

Such arrangements can naturally also be used in condensers which areconstructed in one piece.

In Fig. 11, in which an integral condenser is shown (condenser portionand leadthrough portion in one piece) the contact between the innercoating 2 and the bolt 7 is effected by brush-like springs 33 which arepressed into contact by means of a sleeve 3st and a helical spring 35hearing against a collar of the bolt 7. The bolt 7 is constructed in theform of a tube, and the springs are connected with this tube by a wire36soldered at both ends. The tube 7 is also in good electrical connectionwith the upper cap 5. It is obvious that the conductive connectionbetween the inner coating 2 and the tubular bolt 7 can also be eftectecby means of a wire 37 soldered at both ends, as is shown in Fig. 11a. Inthis case, in order to obtain a good soldering of the wire with theinner coatings 2, 16, the reinforcing layer 16 must be correspondinglythick, to a degree which is not necessary when contact springs 33 areused. The wire 37 may also be connected to the inner coating bygalvanization instead of by soldering.

' Another two-part embodiment is shown in 13. Here the condenser portiona proper is, as it were, inserted in an eX- posed outer coverconstituting the leadthrough part b. At the point of support the exposedouter cover is provided with a strongly ire-entrant concave portion 8which ensures freedom from surface sparking on this exposed portion byreducing the field intensity. The space between the condenser portion aand the protective cover 7) is filled up to the level 14 with oil orpaste 12.01 high specific breakdown strength. The two parts Z) and a arecemented together by a correspondingly shaped fitting such as a flangeddisc member 38. The disc member may either be provided with a forkedextension 6 as shown in Fig. 12,

by means of which the subsequent condenser of a series can be hung bymeans of a transverse bolt, or it may have a fiat bottom, as in Fig. 13,in order to be mounted on a surface. As shown in Fig. 12, an externalannular rim 9 on the condenser portion a may be provided with a hollowchannel or concave portion 15 to reduce the field intensity at the uppermargin of the coating 1. The conductive connection with the outercoating of the condenser portion is effected by means of a metalliccover 39 placed on this portion which carries a bolt 7 attached to aflanged end plate inserted in the top opening of the part b. A spring 40is inserted between this end plate and the cap 5 to ensure electricconnection.

The embodiments of Figs. 12 and 13 afford the special advantage that thecondenser portion which must be made with comparatively thin walls, asthe capacity decreases with increasing wall thickness, is protectedagainst damage in the interior of the exposed outer cover. This point isimportant, because the high tension condensers must be hung in the openon high tension masts and in part at very low levels, and consequentlymay constitute an easy target for stones, small shots and the like. Suchdamage is less to be feared in the protective sheath, as this may bemade with stronger Walls, and is also protected by the sheds orpetticoats.

In the construction of high tension condensers from ceramic materials orglass, such as heretofore described, attention has to be given to thefact that the different parts are quite differently stressed. Whereasthe condenser vessel is primarily highly electrically stressed and thusmust have a very high breakdown strength and a very high dielectricconstant, the strains on the exterior leadthrough part are primarily ofa mechanical and thermal nature.

The present invention takes account of this circumstance, in that thechoice of materials for the preparation of the condenser vessel on theone hand and the outer covering on the other, is made in correspondencewith "these stresses; thus the material for the manutacture of thecondenser part, in consequence of the'choice of the substances ormixtures used in its preparation, has a very high electrical breakdownstrength and a high dielectric constant, and the material out of whichthe lead-through part is made has a mechanical and thermal resistance ashigh as possible.

In consequence, we prefer for the preparation of the condenser partporcelain which is so composed and treated in a manner wellknown to anyexpert in the art that it has the requisite high breakdown strength andthrough portion, 3

. from which the condenser vessel is made has a high dielectricconstant, this has the special advantage that the dimensions of thecondenser for a given capacity may be kept small. 4

In order to relieve the electrically stressed lead-through part, it is'desirable to fill its interior space with an insulating material insteadof with air. This, however, is not readily possible with constructionssuch as shown in Figs. 3 and 4 because the leadthrough part is disposedabove the condenser part and thus the condenser part would also have tobe filled if it is desired to fill the leadthrough part. As the fillingis expensive, however, this would unnecessarily increase the productioncost.

This disadvantage may be avoided by interchanging the position of thetwo parts so that the lead-through part is arranged beneath thecondenser part. In this manner the use of an insulating medium withinthe lead-through part is facilitated and-the occurrence of dischargelongitudinally thereof is reduced to a minimum.

Various embodiments of such a design are shownin Figs. 14 to 17, Figs.14 and 15 illustrating an integral construction of the condenserand'Figs..16 and 17 a multi-part construction with the parts in nestedposition similar to Fig. 12. Figs. 14 and 16' are for a suspendedarrangement, Figs. 15 and 17 are intended to stand.

As in the embodiments heretofore described a is the condenser portion, bthe leadthe petticoats or sheds on the lead-through portion, 7 theconnecting wire, 11 the annular rib, 20 the member by means of which thelead-through and condenser parts are cemented together. The annular ribmay extend down to the bottom fitting '5 as indicated at 9 in Fig. 16and may be provided with ribs or sheds 43 (Figs. 16 and 17) for thepurpose of increasing the -creepage discharge path.

The lower lead-through portion b of the condenser is filled withinsulating material 12 up to the point 14, whereby the above-mentionedadvantages are obtained.

In Figs. 14 and 16 the arrangement of the individual elements in theirrelative positions is effected by elements 4, 5 such as are generallyused with chain insulators. A tight closure is readily efiected' at thecap 5 by means of a washer or packing disc 12. In F igs. 15 and 17 therelative positioning of the individual elements is effected as isgeneral with open air supporting columns, i. e., the condenser part isembedded in a plate-like support 38 enabling it to stand on a fiatsurface. In this case also a tight closure can be ensured by a packingdisc 42 so that the lead-through portion may be filled complete- 1y witha nonsolid medium.

- The condenser part may be protected against external damage by meansof a protective sleeve 21 as shown in Fig. 16. Preferably, this sleeveis attached to the fitting 5 on the one side and to the annular member20 on the other side, whereby the condenser part will be relieved fromtensional strain. In the embodiments according to Figs. 16 and '17either the space 12a or 12 alone or both can be filled with aninsulating medium.

The conductive connection of the element with the coatings can beeffected as heretofore described, i. e. either by means of a pressurecontact connection, Fig. 15, or by a soldered connection, Fig. 16.

- In .the two part embodiment according to- Figs. 16 and 17 the innerconductive coating can extend as far as the lower fitting, Fig. 16, ormay only be taken as far as a thinning in the neck of the vessel, Fig.17

In Fig. 18 we have illustrated an embodiment which incorporates most ofthe features of our invention as heretofore explained. Thus, thecondenser comprises a hollow body composed of a thin-walled flask-shapedcondenser part a and of a tubular lead-through part or bushing b whichlatter is formed with petti'coats 3 and is coaxially coordinated to thepart a and, more particularly, surrounds the mouth or neck-portionthereof. The condenser part is provided with an internal and an externalconductive coating each of which is connected to one of'the fittings 4:and 5 which are attached to opposite ends of the composite hollow body.Moreover, the external coating on the condenser part is electricallyconnected to a conductive coating 8 provided within a rounded gutterformed by the petticoat which is nearest to the bottom end of theflask-shaped condenser part.

In the embodiment illustrated in Fig. 18 a similar gutter is provided onthe circumfertowards the lower end thereof and constitutes a conicalneck-portion of the flask-shaped part a.

The space between the wall of the tubular lead-through part b and thisextension I which may or may not be equipped with peripheral ribs orpetticoats 43, is filled with a suitable non-gaseous insulating fillingand is sealed by a flanged sealing member which constitutes the fitting5 and is in the form of a plate having two flanges one engaging themouth of the condenser part a and the other one engaging the lower endoft-he leadthrough part b in a similar manner as shown in Figs. 12 and13. From the fitting 5 a conductor 7 extends through the free spaceenclosed by the parts a and b and is provided with a resilient contactmember or spring 33 which serves to ensure electrical connection betweenthe inner coating and the fittingf).

In order to reduce-the field intensity near the rim of'the internalcoating of the condenser part, the collar-shaped extension orneck-portion thereof is formed with an inner circumferential gutter 50the inner face of which is covered bythe marginal Zone of the internalcoating.

In this embodiment, the parts a and b are not integral with each other.For tl'. is reason, means must be provided to rigidly and tightlyconnect these parts. These means comprise a flanged metal ring 20circumferentially cemented to the condenser part a and to the upper endof the lead-through part bin a similar manner as shown in Figs. 4 and 5.A protective metallic sleeve 21 is attached by means of the ring 20 tothe lead-through part b to cover the upper portion of the condenser parta and to relieve it from mechanical stresses.

Leaf-springs 28 are provided to ensureelectrical contact with the sleeve21 of the external coating on the condenser part a.

If we use the filling 12, we prefer to arrange the petticoats 3 in themanner shown in Figs. 12 and 14 to 18, i. e. inclined or turned down inthe direction in which the mouth of the flask-shaped part a points topermit of installing the condenser in the position illustrated.

As heretofore mentioned, we prefer to use different materials for theparts a and b in Fig. 18, a silicic material having a very highdielectric coeflicient and high resistibility against electric puncturefor the former, and a ceramic material significant by high resistibilityagainst heat and mechanical stresses for the latter. Suitablecompositions having, the requisite properties are well known to anyexpert in the manufacture of porcelain or glass for technical purposes.

What We claim is:

1. A high-tension electrical condenser comprising a. hollow body ofsilicic material composed of a thin-walled. flask-shaped condenser partand of a tubular lead-through part coaxially coordinated to the mouth ofsaid condenser part and provided with exterior petticoats, anexternaland an internal conductive coating on said condenser part, fittings attached to said hollow body and electrically connected each to one ofsaid coatings, said condenser part having a collar-shaped extensionarranged in proximity of the rim of said external coating and extendingwithin the lead-through part towards the free end thereof, said internalcoating covering the inner face ofsaid collar-shaped portion.-

2. The condenser claimed in claim 1 in which a conductive coating isprovided within a gutter formed by the )etticoat nearest the bottom endof said flask-shaped condenser part and is electrically connected tosaid external coatin The condenser claimed in claim 1 in which aninsulating filling is disposed within the space between saidcollar-shaped extension and the wall of said tubular lead-throughportion.

4. A high-tension electrical condenser comprising a hollow body ofsilicic material composed of a thin-walled flask-shaped condenser partand of a tubular lead-through part coaxially coordinated to the mouth ofsaid condenser part and provided with exterior petticoats, an externaland an internal conductive coating on said condenser part, fittingsattached to opposite ends of said hollow body and electrically connectedeach to one of said coatings, said flask-shaped condenser part having aconical neck portion provided with an outer annular collar forming arounde gutter the inside of which is covered by the 'marginal Zone ofsaid external coating.

5. A high-tension electrical condenser comprising a hollow body ofsilicic material co1nposed of a thin-walled flask-shaped condenser partand of a tubular leadt-hrough part coaxially coordinated to the mouth ofsaid con denser part and. providedwith exterior petticoats, an externaland an internal conductive coating on said condenser part, asealingmember on the free end of said tubular leadthrough part, said condenserpart having a collar-shaped extension arranged in PI'OXlllb ity of therim of said external coating and ex tending within the lead-through parttowards the free end thereof, said-internal coating covering the innerface of said collar shaped portion, and a conductor extending from saidsealing member through said leadthrough part and said collar-shapedextension into said condenser part and electrically connected to saidinternal coating.

,6. A high-tension electrical condenser comprising a hollow body ofsilicic material coinposcd of a thin-walled flask-shaped condenser partand of a tubular lead-through part coax'ially coordinated to the mouthof said condenser part and provided with exterior petticoats, a sealingmember on the free end of said lead-through part, said condenser parthaving a collar-shaped extension projecting Within said lead-throughpart towards the free end thereof and provided with peripheral ribs, aninner conductive coating on said condenser part and said collar-shapedexteni and to connect one end of said lead-through sion, an electricalconnection between said coating and said sealing member, and an outerconductive coating on said condenser art.

7 A high-tension electrical condenser comprising a hollow body ofsilicic material composed of a thin-walled flask-shaped condenser partand of a tubular lead-through part coaxially coordinated to the mouth ofsaid condenser part and provided with exterior petticoats, an externaland an internal conductive coating on said condenser part, fittingsattached to said hollow body and electrically connected each to one ofsaid coatings, said condenser part having a collar-shaped extensionarranged in proximity of the rim of said external coating and extendingwithin the lead-through part towards the free end thereof and having aninner circumferential ridge at its uppermost end, said internal coatingextending over the inner face of said collar-shaped portion and up tosaid ridge.

8. A high-tension electrical condenser comprising a thin-walledflask-shaped condenser part and a tubular lead-through part both ofsilicic material, the latter part being coaxially coordinated to andsurrounding the mouth of said condenser part and provided with exteriorpetticoats, the condenser part extending at least partially into saidleadthrough part, a flanged ring to rigidly and tightly connect saidparts and to seal the gap defined by the outer periphery of the.condenser part and by the inner periphery of the lead-through part, asealing member on the free end of said lead-through art, an innerconductive coating on said con enser part, an electrical connectionbetween said coating and said sealing member, and an outer conductivecoating on said condenser part.

9. A high-tension electrical condenser comprising a thin-walledflask-shaped condenser part, a' tubular lead-through part both ofsilicic material, the latter part being coaxially arranged on saidcondenser part and provided with exterior petticoats, means to seal partto said condenser part, a flanged sealing member engaging and closingthe mouth of said condenser part and the free end of said lead-throughpart, an internal conductive coating on said condenser part electrical-1y connected to said sealing member and an external conductive coatingon said con- .denser part.

10. A high-tension electrical condenser rest of said condenser part, andconductive coatings on the inner and outer surface of vided with twoflanges, one engaging the mouth of said condenser part and the other thefree end of said lead-through part.

12. A high-tension electrical condenser comprising a hollow body ofsilicic material composed of a thin-walled flask-shaped con denser partand of a tubular lead-through part formed with exterior petticoats andarranged to cover the neck portion of said condenser part, terminalfittings on opposite ends of said body, conductive coatings on the innerand outer surface of said condenser part and resilient contact membersarranged to ensure electric connection between said coatings and said'fittings.

13. A high-tension electrical condenser comprising a thin-Walledflask-shaped condenser part of a silicic material having a very andhaving a high resistibil-ity against heat I and mechanical stresses,said lead-through part being coaxially arranged on said condenser partand formed with exterior petti-' coats, the condenser part extending atleast partially into said lead-through part, a flanged ring to rigidlyand tightly connect said parts and to seal the ga defined by the outerperiphery of the con enser part and by the inner periphery of thelead-through part, external and internal conductive coatings on saidcondenser part, and terminal fittings on both opposite ends of thecomposite body formed by said parts, each fitting being electricallyconnected to one of said coatings.

14. A high-tension electrical condenser com-. prising a lead-throughbushing of silicic material provided with circumferential turneddownpetticoats, a flask-shaped condenser part of silicic material arrangedwithin said bushing with its neck portion downwardly directed, aninsulating filling in the space between said bushing and said neckportion and conductive coatings on the inner and outer surface'of saidcondenser part. i

15. A high-tension electrical condenser comprising a lead-throughbushing o'f silicic material provided with circumferential petticoats, aflask-shaped condenser part of silicic material arranged within saidbushing, a sealing plate having two flanges one engaging the mouth ofsaid flask-shaped condenser part and the other one engaging one end ofsaid bushing, a metal piece to seal the other end of said bushing, aninsulating filling in the space between said bushing and said con denserpart, an internal and an external conductive coating on saidcondenserpart, said internal Coating being electrically connected tosaid plate and said external coating to said metal piece.

In testimony whereof we have aflixed our signatures.

WiLHELM REGERBIS. MARTIN HANDTRAG.

